If I was a London, I would probably vote Oona King over Boris Johnson. But Labour will never pick her. They need to keep Ken's belly rubbed...and theres a lot of interest groups begging to get back into favour...

King would struggle anyway; she doesn't seem to have much in the way of institutional support (yes, she has a lot of MPs onside, but they play no role in selecting candidates at any level). I mean, stranger things have happened, but an upset looks unlikely. Livingstone is also likely to be elected to the NEC.

If by some miracle King does win the nomination, then Livingstone would stand as an Independent again as in 2000. This time though Mayor Johnson would be re-elected easily with King and Livingstone fighting it out for 2nd place. Although the governing party traditionally does poorly in local elections, the Tories would be saved due to the rupture in the Labour party due to Livingstone going rogue. As for the LibDem selection, there's no way Opik will be selected. IMHO the LibDems would select somebody local such as Simon Hughes MP or Lynne Featherstone MP.

If by some miracle King does win the nomination, then Livingstone would stand as an Independent again as in 2000. This time though Mayor Johnson would be re-elected easily with King and Livingstone fighting it out for 2nd place. Although the governing party traditionally does poorly in local elections, the Tories would be saved due to the rupture in the Labour party due to Livingstone going rogue.

If by some miracle King does win the nomination, then Livingstone would stand as an Independent again as in 2000. This time though Mayor Johnson would be re-elected easily with King and Livingstone fighting it out for 2nd place. Although the governing party traditionally does poorly in local elections, the Tories would be saved due to the rupture in the Labour party due to Livingstone going rogue.

Is that really a problem with the preference system though?

Yes, because of the fake IRV. If someone were to vote, say for the Green candidate and then for King, their vote wouldn't count in the event of a Johnson–Livingstone runoff.